* You're thinking of a nickname: Perhaps a specific car model is nicknamed "Cube Car" by someone. If you can provide more details, I might be able to help.
* It's a custom build: Someone might have built a custom car with a cube-like design. The cost would depend entirely on the materials and labor involved.
* It's a fictional car: The car may exist only in a video game, movie, or book.
Please provide more information if you can!
